The phrase User Error or USR error, is a technical term asserting that any issues caused are the fault of the user. It is a euphemistic way to suggest that the device is neither flawed nor poorly designed for human usage, but the user does not understand how to make it work properly. It is generally used by computer techs to imply a lack of computer savvy, but can additionally be used in other contexts.

A number of IT professionals believe user error to be by far and away the most common cause of reported computer issues in the workplace. Common examples include attempting to enter a case-sensitive password with caps-lock on, clicking Yes on message boxes without reading them properly and deleting important files, forgetting to plug an ethernet cable into their laptop's network card when in the office, allowing sessions to timeout when using a web application and erroneous data entry.

User: My password doesn't work! I could log in yesterday...
Admin: Hmmm, must be UE...